ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary The effect of a pigment grade of titanium dioxide on the morphology, crystallisation and mechanical properties of a typical grade of isotactic polypropylene are described. Pigment particles are able to nucleate additional spherulites, and are incorporated within spherulitic and lamellar morphologies. Measurements of isothermal crystallisation rates using differential scanning calorimetry and hot-stage microscopy show that bulk crystallisation rate is increased by addition of the pigment due to the larger number of spherulites, while the growth rate of the spherulites is unchanged. Addition of the pigment increased tensile modulus, and reduced yield stress. The elongation at break and impact resistance were modulus, and reduced yield stress. The elongation at break and impact resistance were increased by the addition of pigment, showing that particle debonding processes can lead to toughening of the polypropylene matrix.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00343073
